Burglar-alarm.



No. 868,543. l PATBNTED 00T. 15, 1907.

H. K. GEIGBP..

BURGLAR ALARM.

P PLIUATION FILED Dno.12.19os.

"1v1 h1 casca I .HANS K. GFIGER, OF MUNICH, GfEltli/IANY,

B URGLAR-ALARM.

Specification of Letters Patent.

Patented 9ct. l5, 1907.

Application filed December 12,1906. Serial No. 347,544.

To all whom 'il may concern,.-

Be it, known that l` HANS K. (1li-nenn, a citizen ot: the Swiss flepublic, residing at Munich, (rermany, have invented new and useful lniprovements in Burglar- Alarms, of which the following is a spccitication.

This invention :relates to portable burglar alarms, comprehending particularly an improved construction of alarm ot' that channter adapted to be used in connection with doors, windows and other like closures to aut(nnatieally give an alarm when the door, window or other closure guarded thereby is opened or tampered with suteiently to throw tl i alarm device into action.

The object ot the invention is to provide a simple, cheap, reliableAv and etlicient alarm device ol` this character embodying a lexible or elastic body or clement designed to pnetnnatieally operate an audible signal carried thereby` said body being provided with nnans l'or normally holding the salne inoperative and adapted to produce signal sounding energy when such holding means is released.

Some o'l' the forms fnntemplated by my invention are illustrated in the accompanying drawings, in whichz* Figure l is a penlpective view showing the alarm arranged in operativ:A position upon a door. Fig. isa horizontal cross section through the locking jamb of the door trame, the swinging stile of the door and the ala-rm device. Fig. 3 is a longitudinal section through the alarm device as it appears when in iwi-mal or inoperative position. Fig. l is a view in iront elevation showing a modified form ol the alarm as applied for use upon a door. Fig. 5 is a sectional view through the door, showing the mode ot' application ol' the alarm disclosed in Fig. lt.

Referring to Figs. .l to 3, inclusive, the alarm comprises a flexible or elastic pneumatic body or casing, en'ibracing a flexible tube l hernietieally closed at its ends b v heads 2 suitably attached to the tube. Within the hollow body thus l'ormed is arranged a coiled spring 3 bearing terminally upon the heads 2 and adapted to exert; its expansive energy to torce the heads apart and thereby dislend the bodyl One of the heads 2 carries an audible alarm 4, shown in the form ot' a whistle havA ing its air passage connecting the interior ol' the hollow body with the extern-.il atmosphere. .lh is whistle is so constructed as to be sounded when the body is distended by the spring through the action of air passing tlnretlntnlgh into the body to fill the partial vacuum formed within said body when the latter is `folded or compressed.

.ln setting the alarm l'or action, the heads are forced together to compress the b ody inthe manner shown in Fig. 2, the flexible tube l .folding in accordion-shape, such compression serving to exhaust the air from the body through the whistle to form a partial vacuum therein, and the body is held in such condition by hold# ing means, which I will now proceed to describe, the release of said holding means permitting the body to be restored to normal or d istended position by the action of the spring, so that the entering air will sound the alarm whistle.

The holding means shown comprises a pair of jaws or plates 5 adapted to bear externally against the heads 2 and provided with inwardly bent arms 6 rebent to form supporting projections 7 adapted to lie in contact when the holder is arranged to maintain the alarm in folded or collapsed condition. The supporting projections are designed to be fitted into the space or crack between the locking jamb 8 of the door ira-me and the swinging stile 9 of the door and to be clamped therein to secure the alarm in operative position, as will be clearly understood by refer ence to Figs. l and 2.

When the door is opened the parts of the holder will be released, thus allowing the body to be expanded or distended by the spring, whereupon the area of said body will be increased and air will be drawn thereinto through the whistle by the suction thus induced, thus causing the whistle to sound and give the alarm. The alarm will be freed and allowed to drop upon the floor when the door is fully opened or only opened sufficiently to displace the supporting projections 7 oi the holder. This form of the invention is also applicable to windows and similar closures, as the projections 7 may be fitted into the space between the meeting rails of the window sashes, so that the alarm will be released when either sash is partially opened.

` ln the embodiment of the invention shown in Figs. t and 5 the elastic body is of the same construction, but the holding jaws or plates 5 have their inwardly bent arms 6/ formed with knuckles hingedly connected by a pintle pin l0, which is formed at one end with a supporting projection ll adapted to enter the keyhole l2 in the door through the opening in the keyhole plate 13. Pins lll, or their equivalent, are also employed to assist in. sujiiporting the alarm and to normally hold the body from expansion, such pins being arranged upon the opposite sides oi the device to bear against the jaws 5/ and driven a sufficient distance .into the swinging stile 9 oi the door. When a key or other tool is inserted into the keyhole l l2 from without; in an attempt to unlock the door, the alarm will be iorced lorward and displaced by the pressure of the key against the projections ll, so that the device will pass beyond the pins 14 and drop upon the floor, leaving the hollow body to be free to be eX- panded by the spring. It will be understood that in this operation the jaws 5/ will swing outward on their hinge connection under the pressure of the spring, thus permitting the hollow body to distend and cause the sounding ot the Whistle in the manner prevously described.

Having thus described the invention7 claimed as new, isz- 1. A burglar alarm comprising a longitudinally expansible bellows tube, heads closing the ends of the tube, au audible alarm supported by one of the heads, means for normally holding the tube in expanded condition, and holders arranged to bear upon the heads to maintain the tube in a collapsed condition.

2. A burglar alarm comprising a longitudinally expansible tubo, heads closing the ends of the tube, an audible alarm supported by one ot' the heads, an expansion spring' arranged within the tube and bearing against the heads, and a holder comprising members adapted to bear against what is the heads to maintain the tube normally in a collapsed condition against the pressure of the spring.

3, A burglar alarm comprising a longitudinally expansible tube, heads closing the ends of the tube, an audible alarm supported by one of the heads, means for normally extending the tube, and a holder comprising jaws arranged to bear against the heads and provided with supporting portions adapted to Contact, said devices being adapted to releasably maintain the tube in a collapsed condition.

In testimony whereof, 1 aix my signature in presence o1' two witnesses.

HANS K. GEIGER.

Witnesses z ABRAHAM ScHLnsrNGnn, LOUIS F. MULLER. 

